<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="js/vue.js"></script>
</head>
<body>
    <div id="app">
        <div ref="self">test</div>
    </div>
    <script>
        var vm=new Vue({
        el:'#app',
        data:{
            msg:'ok'
        },
        beforeDestroy() {
          console.log('销毁之前');
          console.log('this.$refs.self');  
          console.log('this.msg');  
          console.log('vm');  
        },
        destroyed() {
          console.log('销毁之后');  
          console.log('this.$refs.self');  
          console.log('this.msg');  
          console.log('vm');  
        },
        })
    </script>
</body>
</html>